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Derivative Financial Instruments - Classifications and Hedging Relationships (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount $ 363,003 $ 333,012
Derivative Asset, Fair Value, Gross 2,454 2,453
Derivative Liability, Fair Value, Gross (4,396) (4,749)
Derivative Asset [Abstract]    
Amounts subject to master netting arrangements (1,251) (1,223)
Cash collateral (received) posted for amounts subject to master netting arrangements (511) (546)
Net Amount in Consolidated Balance Sheets 692 684
Derivative Liability [Abstract]    
Amounts subject to master netting arrangements 1,251 1,223
Cash collateral (received) posted for amounts subject to master netting arrangements 556 555
Net amount (2,589) (2,971)
Cash flow hedges | Interest rate contracts | Swap | Commercial loans    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 19,400 16,650
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross 0 0
Fair value hedges | Interest rate contracts    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 23,115 23,490
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross (53) (68)
Fair value hedges | Interest rate contracts | Swap | Long-term debt    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 16,018 16,393
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross (53) (68)
Fair value hedges | Interest rate contracts | Swap | AFS securities    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 7,097 7,097
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross 0 0
Not designated as hedges    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 320,488 292,872
Derivative Asset, Fair Value, Gross 2,454 2,453
Derivative Liability, Fair Value, Gross (4,343) (4,681)
Not designated as hedges | Client-related and other risk management    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 280,841 257,003
Derivative Asset, Fair Value, Gross 2,358 2,293
Derivative Liability, Fair Value, Gross (4,225) (4,592)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Swap    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 160,381 155,670
Derivative Asset, Fair Value, Gross 625 579
Derivative Liability, Fair Value, Gross (2,169) (2,665)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Options    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 42,648 29,840
Derivative Asset, Fair Value, Gross 171 172
Derivative Liability, Fair Value, Gross (166) (192)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Forward commitments    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 791 1,495
Derivative Asset, Fair Value, Gross 2 8
Derivative Liability, Fair Value, Gross (10) (2)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Other    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 3,092 3,823
Derivative Asset, Fair Value, Gross 8 1
Derivative Liability, Fair Value, Gross (7) 0
Not designated as hedges | Client-related and other risk management | Equity contracts    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 34,979 33,185
Derivative Asset, Fair Value, Gross 727 644
Derivative Liability, Fair Value, Gross (1,109) (901)
Not designated as hedges | Client-related and other risk management | Credit Contract | Trading assets    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 160 140
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross 0 0
Not designated as hedges | Client-related and other risk management | Credit Contract | Loans and leases    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 780 394
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross (1) 0
Not designated as hedges | Client-related and other risk management | Credit Contract | Risk participation agreements    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 7,156 6,824
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross (3) (3)
Not designated as hedges | Client-related and other risk management | Credit Contract | Total Return Swap    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 1,793 1,729
Derivative Asset, Fair Value, Gross 71 81
Derivative Liability, Fair Value, Gross (6) (2)
Not designated as hedges | Client-related and other risk management | Foreign exchange contracts    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 21,527 19,022
Derivative Asset, Fair Value, Gross 300 364
Derivative Liability, Fair Value, Gross (304) (380)
Not designated as hedges | Client-related and other risk management | Commodity Contract    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 7,534 4,881
Derivative Asset, Fair Value, Gross 454 444
Derivative Liability, Fair Value, Gross (450) (447)
Not designated as hedges | Mortgage banking | Interest rate contracts    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 5,777 3,382
Derivative Asset, Fair Value, Gross 28 27
Derivative Liability, Fair Value, Gross (29) (23)
Not designated as hedges | Mortgage banking | Interest rate contracts | Swap    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 227 115
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross 0 0
Not designated as hedges | Mortgage banking | Interest rate contracts | Other    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 243 140
Derivative Asset, Fair Value, Gross 1 1
Derivative Liability, Fair Value, Gross 0 0
Not designated as hedges | Mortgage banking | Interest rate contracts | Interest rate lock commitments    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 1,837 999
Derivative Asset, Fair Value, Gross 12 1
Derivative Liability, Fair Value, Gross (12) (17)
Not designated as hedges | Mortgage banking | Interest rate contracts | When issued securities, forward rate agreements and forward commitments    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 3,470 2,128
Derivative Asset, Fair Value, Gross 15 25
Derivative Liability, Fair Value, Gross (17) (6)
Not designated as hedges | Loan Servicing Rights | Interest rate contracts    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 33,870 32,487
Derivative Asset, Fair Value, Gross 68 133
Derivative Liability, Fair Value, Gross (89) (66)
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | Swap    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 14,329 14,566
Derivative Asset, Fair Value, Gross 0 0
Derivative Liability, Fair Value, Gross 0 0
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | Options    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 15,089 13,930
Derivative Asset, Fair Value, Gross 53 122
Derivative Liability, Fair Value, Gross (85) (48)
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | Other    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 2,268 1,532
Derivative Asset, Fair Value, Gross 1 0
Derivative Liability, Fair Value, Gross (1) (3)
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | When issued securities, forward rate agreements and forward commitments    
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]    
Notional Amount 2,184 2,459
Derivative Asset, Fair Value, Gross 14 11
Derivative Liability, Fair Value, Gross $ (3) $ (15)